5565115721 has 32 divisors (see below), whose sum is σ = 6357851136. Its totient is φ = 4826520000.

The previous prime is 5565115711. The next prime is 5565115723. The reversal of 5565115721 is 1275115655.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5565115721 - 2¹⁰ = 5565114697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5565115723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5100386 + ... + 5101476.

It is an arithmetic number, because the mean of its divisors is an integer number (198682848).

Almost surely, 2^5565115721 is an apocalyptic number.

It is an amenable number.

5565115721 is a deficient number, since it is larger than the sum of its proper divisors (792735415).

5565115721 is a wasteful number, since it uses less digits than its factorization.

5565115721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373.

The product of its digits is 52500, while the sum is 38.

The square root of 5565115721 is about 74599.7032232703. The cubic root of 5565115721 is about 1772.1129522927.

The spelling of 5565115721 in words is "five billion, five hundred sixty-five million, one hundred fifteen thousand, seven hundred twenty-one".